Talk about flips! A Brooklyn brownstone is on the market for a whopping $7.9 million — just three years after it sold at auction for $1.3 million.

At that time, the abandoned Boerum Hill home at 374 Pacific St. was so run-down that it was damaging adjacent homes: Neighbors actually received $1 million in compensation from the sale. And the home was so ravaged that the new owner fell through the flooring.

The 19th-century landmarked mansion is in an area that boasts celebrity residents like Ethan Hawke, Michelle Williams and Keri Russell.

“It’s extremely hard to find ahome or condoof this size in Brooklyn,” says the seller, Effie Dilmanian, who has been buying, fixing up and selling houses for 20 years.

Dilmanian knew he could make money on the brownstone, which, at 26 feet wide, is bigger than more typical 20- to 25-foot-wide townhouses. However, he has hit a sweet spot in the market and is asking almost double what he thought he could get when he bought it in 2010. The listing broker is Douglas Elliman’s Alex Maroni, who just sold Bed-Stuy’s first million-dollar condo.

Capital gains

A former Washington, DC, textile museum made up of two mansions is on the market for $22 million. The homes come with gardens on 34,000 square feet of land at 2320-2330 S. St. NW, within sight of the White House.

John Russell Pope, who designed the Jefferson Memorial, the National Gallery of Art’s West Wing and the National Archives, among other landmarks, built one of the homes for timber mogul George Hewitt Myers in 1915. Two years later, Myers bought the adjacent property,

The textile museum, with 19,000 objects dating back to 3000 BC in its collection, is moving to George Washington University.

Designed to sell

John Edelman, CEO of Design Within Reach, is in contract to sell his penthouse at 150 W. 26th St. for more than $4 million, a source says.

The unnamed buyer will enjoy a space that Edelman designed himself. The three-bedroom, 2,000-square-foot condo was listed for $4.5 million — down from $4.995 million a few months ago. The unit includes 12-foot ceilings and three private terraces that total 3,000 square feet of outdoor space.

Kelli Carpenter, who was once married to Rosie O’Donnell, is listing her two-bedroom penthouse at the Platinum condo building on West 46th Street for $2.25 million.

The buyers of the apartment, purchased for $2 million in 2008, are listed as The Roseann O’Donnell Revocable Living Trust and Roseann O’Donnell. However, O’Donnell tells us via Twitter that it is Carpenter’s apartment. The residence is near the offices of Nickelodeon, where Carpenter, who recently remarried, formerly worked as a marketing executive.

O’Donnell also is selling her $10.5 million home at 130 W. 12th St., as we reported exclusively. O’Donnell tells us she is selling because “we adopted a baby and my son got into a school in New Jersey, so we won’t need it.”

However, O’Donnell added that she will keep a one-bedroom pied-a-terre that she owns in the Theater District. Her primary residence is in Nyack.

Delicious deal

That’s a lot of pasta. The owners of the Serafina Restaurant Group, Vittorio Assaf and Fabio Granato, have listed a five-story building at 27 E. 61st St. for $18.5 million.

The building — which is under construction and being expanded to 8,100 square feet — includes two private residential floors, two commercially zoned floors and a restaurant with a 10-year rent roll in place. The Geisha restaurant is slated to reopen there in January with two sushi bars, a lounge and table seating for 160 people. It was previously located down the street.

The property comes with air rights and a rooftop terrace. The listing broker is Reba Miller of Core.

We hear . . .

That this year’s Hampton Designer Showhouse 2013 is at 990 Brick Kiln Road in Bridgehampton, where designers are spending around $25,000 to design each room. The house is listed for $5.8 million. . . . That Corcoran Group broker Sharon Bush was in the crowd at Art Southampton this week. Actress Mariska Hargitay also attended, and bought two “Petri Installations” by Klari Reis. . . . That instead of creating their annual showhouse, Country Living magazine is helping a resident of Hurricane Sandy-devastated Breezy Point, Queens, rebuild her home. Marian Lizzi, whose beach bungalow was destroyed, is now getting a new look from designer Emily Henderson. Lizzi’s parents met in Breezy Point in the 1950s, and she bought her own home there in 2007.